10x+7y=-3 and 5x-y=3​

Answers

Answer 1

Step-by-step explanation:

{

x

=

1

y

=

4

Explanation:

Take a look at your starting system of equations

{

5

x

+

y

=

9

10

x

7

y

=

18

Notice that if you multiply the first equation by

(

2

)

, and add the right-hand sides and the left-hand sides of the equations separately, you can eliminate the

x

-term.

This will leave you with one equation with one unknown,

y

.

{

5

x

+

y

=

9

(

2

)

10

x

7

y

=

18

{

10

x

2

y

=

18

10

x

7

y

=

18

---------------------------------------------------

10

x

2

y

+

10

x

7

y

=

18

+

(

18

)

9

y

=

36

y

=

(

36

)

(

9

)

=

4

Now use this value of

y

in one of the two original equations to find the value of

x

5

x

+

(

4

)

=

9

5

x

=

5

x

=

5

5

=

1


Related Questions

The sum of two numbers is 58. The difference between the same two numbers is 6. Find the two numbers, and then find the PRODUCT of the two numbers.

Answers

Answer:

26 and 32 are the two numbers, the product is 832

The life of light bulbs is distributed normally. The variance of the lifetime is 900 and the mean lifetime of a bulb is 520 hours. Find the probability of a bulb lasting for at most 576 hours. Round your answer to four decimal places.

Answers

Answer:

0.969

Step-by-step explanation:

Given that:

Mean lifetime (m) = 520 hours

Variance = 900

Hence, standard deviation (s) = √900 = 30

Probability that bulb will last for at most 576 hours

X ≤ 576

Obtain the standardized score :

Using the relation :

Zscore = (x - m) / s

Zscore = (576 - 520) / 30

Zscore = 56 / 30

Zscore = 1.867

P(Z ≤ 1.867) : using the z probability calculator ;

P(Z ≤ 1.867) = 0.96905

Hence, P(Z ≤ 1.867) = 0.969

n/4 + 1 =5 how do I solve this and show my work​

Answers

Answer:

n=16

Step-by-step explanation:

n/4 + 1 = 5

inverse operations, (subtract the one from both sides)

n/4 = 4

inverse operations, multiply by 4 on both sides, (you're isolating the variable)

n = 16

4(2x−9)=4 solve for x

Answers

Answer: x=5

Step-by-step explanation:

Distribute the 4 to the 2 and 9 and you will get (8x-36)=4.

Then you'd add the 36 to 4 to get 40.

Lastly you'd divide 8 and 40 to get 5. Hope this helps!!!

An artist mixes colors for a painting. She mixes 1.5 ounces of blue with 2.5 ounces of yellow to get the perfect shade of green. If she determines that she will need 12 ounces of green, how much yellow paint will she need?

Answers

Answer:

4.5 ounces of yellow and 7.5 ounces of blue will create 12 ounces of the perfect shade of green.

Step-by-step explanation:

1.5 + 2.5 = 4 ounces.

Multiply by 3

4.5 + 7.5 = 12 ounces

So, she needs 4.5 ounces of yellow.

how to find the sale price of an item that has been discounted 25%

Answers

Answer:

Multiply the normal price of the item by .25 and then subtract that from the normal price.

Step-by-step explanation

[tex]x -(x*.25)[/tex]  

x is the item

Step-by-step explanation:

100%-25%= discounted price= 75%

You do the discounted price divided by 75 to find 1%

do that times 100 to find the pre-discounted price.

e.g

find the original price of a sweater when it was on sale of 25%. the sale price is £15.00.

£15.00 = 75%

15.00 divided by 75 = 1% =£0.20

£0.20 x 100 = pre-sale price = £20.00

The price of the sweater before the sale is £20.00.

You are welcome xx

1 +1 = ???????????????????????????

Answers

Answer:

IT 2

Step-by-step explanation:

N+ 5/16=-1



:)))) ASAP

Answers

Answer:

Step-by-step explanation:

16N+5=-16 (multiply by 16)

16N=-21 (subtract 5)

N=-21/16 (divide by 16)

Please mark brainliest Hope this helps :D

1
How many – cup servings of ice cream are in 3 cups of ice cream?
4

Answers

Answer:

well.......................................3 cups are in a cup serving

Step-by-step explanation:

Answer:

3

Step-by-step explanation:

A math quiz has 10 questions and is scored out of 100. Each question is worth the same. The function S(q) represents the quiz score, S, in terms of the number of correctly answered questions, 2-
Determine whether each statement below is true or false. Select True or False for each statement.
True False
Sla) represents a quantity that changes at a constant rate per unit interval.
Sla) represents a quantity that changes at a constant percent rate per unit interval
S[9) represents a linear function
S(a) represents an exponential function

Answers

Answer:  S(q) represents a quantity that changes at a constant rate per unit interval is true and S(q) represents a linear function is true. The rest is false. Hope this helps

Step-by-step explanation:

Solve for s.
8 - 4s = s + 13

Answers

Answer:

s= -1

Step-by-step explanation:

what is 1/2 times 5/4?

Answers

Answer:

1 x 5 = 5

2 x 4 = 8

5/8 is the answer.

Answer:

5/8 or 0.625

Step-by-step explanation:

1/2 * 5/4

= 5*1/4*2

=5/8

HELP PLEASE!!!!

Describe two ways to find the distance between
two points on a Coordinate Plane.

Answers

distance formula and midpoint formula

distance: to find the distance between two points on a plane

midpoint: to find the midpoint between two points

Which expression is equivalent to 28/19/100

Answers

Answer:

Brainly doesn’t help people

Step-by-step explanation:

Khan Acadmey or Google helps! Trust me this doesn’t help

That other person who commented is dumb

Round 859, 344 to the nearest thousand.

Answers

Answer: 860,000

Step-by-step explanation:

Since the nearest thousand is mostly higher then most of the numbers in the number line, we know that 9 is greater. It's close to 60,000 if we remove the 8. Therefore, the answer is 860.000

Louisa used Downtown Taxi, which charges $2 for the first mile and $1.10 for each additional mile. Pietro used Uptown Cab, which charges $5 for the first mile and $0.95 for each additional mile. They paid the same amount and traveled the same distance. How far did they travel?

Answers

Answer: 21 miles

Step-by-step explanation:

1) A golf store pays its wholesaler $40 for a certain club, and then sells it to
a golfer for $75. What is the markup rate?

Answers

The markup rate is 87.5%

The markup rate will be 87.5%.

Amount paid to wholesaler = $40

Amount that the good was sold = $75

Markup = $75 - $40 = $35

Markup percentage will be:

Markup/Cost price × 100

= (35/40) × 100

= 0.875 × 100

= 87.5%

Learn more about markup rate on:

https://brainly.com/question/16710746

If two numbers are opposites and one number is 32 what is the other number

Answers

Answer:

-32

Step-by-step explanation:

the opposite of a positive number is a negative number

Which equation can you use to solve 150% of 500?

Answers

Answer:

150×500=30, i got you man

A car has 15 gallons of gas in its tank. The car travels 35 miles per gallon of gas. It uses 1/35 of gas to go 1 mile. How much gas dose the car use to 100 miles? Show your reasoning.

Answers

Answer:

um......I think 2 figure it out....

Step-by-step explanation:

A car has 15 gallons of gas in its tank. The car travels 35 miles per gallon of gas. It uses 1/35 of gas to go 1 mile.

negative six plus a number
is less than or equal to fifteen

Answers

Answer:

-6+x≤15

negative six: -6

plus: +

a number: variable (I chose x)

Less than or equal to: ≤ (an inequality)

fifteen: 15

Answer:

-6 + n ≤ 15

or

n ≤ 21

Step-by-step explanation:

negative six is -6

plus a number would be a variable (I will use n) + n

is less than or equal to would be ≤

fifteen is 15

-6 + n ≤ 15

If you want to solve it, continue

-6 + n ≤ 15

+6         +6

n ≤ 21

I hope that this helps! :)

Zoey wants to use her iPad throughout a 6-hour flight. Upon takeoff, she uses the iPad for 2 hours and notices that the battery dropped by 25%, from 100% to 75%. How many total hours can Zoey expect from the iPad on a full battery charge?

Answers

Answer:

6 hours more

Step-by-step explanation

When Zoey started the flight the battery was 100%, then it dropped to 75% in 2 hours. So each 25% will last 2 hours and there is 75% remaining which if you divide by 3 it will give 1. And each 25% will last 6 more hours until the battery dies.

what is the new equation of the quadratic function​

Answers

Answer:

cant really see it

Step-by-step explanation:

I NEED HELP ASAP!!! PLEASE REPLY!!

Answers

Answer:

Both are correct

Step-by-step explanation:

Answer: both are correct

Step-by-step explanation:

Both are correct

you can use either way to solve it.

Who voted on red 。 • ゚ 。 .


. . 。 。 .


. 。 ඞ 。 . • •


゚ Red was not An Impostor. 。 .


' 1 Impostor remains 。


゚ . . , . .

Answers

Answer:

i used to play that

Step-by-step explanation:

Ok ok I think it’s black
Blacks sus

PLZ HELP!!!! WILL MARK BRAINLEST IF CORRECT

Answers

Answer: the answer is 54

Step-by-step explanation: The error in the expression was that it was multiplied by 1 so it can't be one unless it was also 1 and it's not it is 54.

9.81 rounded to the nearest 10th is what?

Answers

Answer:

9.80

Step-by-step explanation:

2+2=4 and more is 2x4 it is

Answers

Answer:

Step-by-step explanation:

You can view 3x3 as 3+3+3.  3x4 is 3+3+3+3.  3x4 is also 4+4+4.  And so forth.

So, you can see how 3+3 is the same as 3x2.  

Hopefully, you can also see that 2x2 is 2+2 for the same reason.  It becomes trivial.

Answer:

2+2=4is not more then 2X4

Step-by-step explanation:

what is 75 percent of 225? 30 57.25 75 168.75

Answers

Answer:

168.75

Step-by-step explanation:

hope this helps :3

if it did pls mark brainliest

Answer:

168.75

Step-by-step explanation:

Multiply 0.75 and 225 together

(0.75 = 75%)

0.75(225) = 168.75

So 168.75 is 75% of 225

Hope this helped :)

Brainliest?

Alonso multiplied the fractions 312and (−414) and got a product of −1218. Describe the mistake that Alonso made. What is the correct product?

CAUTION: I NEED HELP!!!!!!

Answers

Sorry I thought I was gonna understand but I don’t but good luck:) you can do it
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